When in trouble, many teenagers go to their friends             for advice.

There is an old temple        from 2000 BC on the top of the mountain.

        with the size of the whole earth , the biggest ocean does not seem big at all .

Some people believe that they would be better off     more adaptive activities in their leisure time, such as establishing relationships and teaching their children．

The student, if well _____ , will pass the examination without much difficulty.